NAME

       MPI_Get_address - Gets the address of a location in memory.

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Get_address(const void *location, MPI_Aint *address)

Fortran Syntax

       INCLUDE 'mpif.h'
       MPI_GET_ADDRESS(LOCATION, ADDRESS, IERROR)
            <type> LOCATION(*)
            INTEGER   ADDRESS, IERROR

C++ Syntax

       #include <mpi.h>
       MPI::Aint MPI::Get_address(void* location)

INPUT PARAMETERS

       location  Location in caller memory (choice).

OUTPUT PARAMETERS

       address   Address of location (integer).

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       MPI_Get_address returns the byte address of a location in memory.

       Example: Using MPI_Get_address for an array.

       EAL A(100,100)
          INTEGER I1, I2, DIFF
          CALL MPI_GET_ADDRESS(A(1,1), I1, IERROR)
          CALL MPI_GET_ADDRESS(A(10,10), I2, IERROR)
          DIFF = I2 - I1
       ! The value of DIFF is 909*sizeofreal; the values of I1 and I2 are
       ! implementation dependent.

NOTES

       Current  Fortran  MPI codes will run unmodified and will port to any system. However, they
       may fail if addresses larger than 2^32 - 1 are used in the program. New  codes  should  be
       written  so  that  they  use the new functions. This provides compatibility with C/C++ and
       avoids errors on 64-bit architectures. However, such newly written codes may  need  to  be
       (slightly)  rewritten  to  port  to  old  Fortran 77 environments that do not support KIND
       declarations.

ERRORS

       Almost all MPI routines return an error value; C routines as the value of the function and
       Fortran  routines in the last argument. C++ functions do not return errors. If the default
       error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then  on  error  the  C++  exception
       mechanism will be used to throw an MPI::Exception object.

       Before  the  error value is returned, the current MPI error handler is called. By default,
       this error handler aborts the MPI job, except for I/O function errors. The  error  handler
       may    be   changed   with   MPI_Comm_set_errhandler;   the   predefined   error   handler
       MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not
       guarantee that an MPI program can continue past an error.